A screen shot of a gui would have gone much farther than a few demo's.
They have made some sort of cropped picture:
<img src="http://www.stencyl.com/static/sw/sw1.png">
Oh wait, this looks a lot like Scratch
<img src="http://origin.arstechnica.com/journals/microsoft.media/scratch1.png">
Not to bash the program, but it looks just too similar beetwen these two screens.
And after playing the games, it just feels like it doesn't really make more things than Construct, but we just have to wait till the final product.
The thing I do like is that you can make Browser games like flash with that.